ERDDAP > info > bcodmo_dataset_516062

Grid DAP Data	Sub- set	Table DAP Data	Make A Graph	W M S	Source Data Files	Acces- sible	Title	Sum- mary	FGDC, ISO, Metadata	Back- ground Info	RSS	E mail	Institution	Dataset ID
		data	graph		files	public	[Th-234 activity] - Water column Th-234 activity determined using a 4-L technique from samples collected on R/V Melville cruise MV1008 in the Costa Rica Dome in 2010 (CRD FLUZiE project) (Costa Rica Dome FLUx and Zinc Experiments)		F   I   M	background			BCO-DMO	bcodmo_dataset_516062

The Dataset's Variables and Attributes

Row Type	Variable Name	Attribute Name	Data Type	Value
attribute	NC_GLOBAL	access_formats	String	.htmlTable,.csv,.json,.mat,.nc,.tsv,.esriCsv,.geoJson,.odvTxt
attribute	NC_GLOBAL	acquisition_description	String	4-L samples for analysis of water column 234Th concentrations were typically taken at 12 depths spanning the upper 150 m on two casts per experimental cycle. On two cycles in the core of the CRD, an additional set of 8 samples was taken to assess 234Th deficiency down to 500-m depth. Samples were analyzed by standard small volume procedures (Benitez-Nelson et al. 2001, Buesseler et al. 2001, Pike et al. 2005). Immediately after collection, samples were acidified to a pH < 2 with concentrated HNO3, spiked with 1 mL 230Th tracer (0.17 Bq mL-1), shaken vigorously, and allowed to equilibrate for 4-9 hours. Samples were then basified to a pH of 8-9 with NH4OH. 100 uL each of KMnO4 (7.5 g L-1) and MnCl2 (33 g L-1) were added and samples were shaken then allowed to sit for >8 hours as Th co-precipitated with manganese oxide. Samples were then filtered at high pressure onto a quartz microfiber (QMA) filter, dried in a drying oven, and mounted into RISO sample holders for beta counting. Samples were beta counted at the University of South Carolina on a RISO low- level beta multi-counter within two months of the collection date. After an additional 8 months, samples were recounted to determine background beta emissions. Detector efficiency was calibrated using four samples taken from 2000-m depth (in water columns exceeding 3000-m depth), which were assumed to be at equilibrium with respect to 234Th and 238U. After background counts yield analyses were conducted as follows. Manganese oxide precipitate was dissolved from filters in 10 mL 8M HNO3/10% H2O2. 1 mL of 229Th (1.66 Bq g-1) tracer was then added gravimetrically, and the sample was sonicated for 20 minutes and allowed to sit for >6 hours. An aliquot of this solution was then filtered through a 0.1-mm syringe filter and diluted with 2.2M HNO3/1%HF for mass spec analysis of the 229:230Th tracer ratio at the Woods Hole Oceanographic Institution Analytical Facility.
attribute	NC_GLOBAL	awards_0_award_nid	String	515386
attribute	NC_GLOBAL	awards_0_award_number	String	OCE-0826626
attribute	NC_GLOBAL	awards_0_data_url	String	http://www.nsf.gov/awardsearch/showAward?AWD_ID=0826626
attribute	NC_GLOBAL	awards_0_funder_name	String	NSF Division of Ocean Sciences
attribute	NC_GLOBAL	awards_0_funding_acronym	String	NSF OCE
attribute	NC_GLOBAL	awards_0_funding_source_nid	String	355
attribute	NC_GLOBAL	awards_0_program_manager	String	David L. Garrison
attribute	NC_GLOBAL	awards_0_program_manager_nid	String	50534
attribute	NC_GLOBAL	cdm_data_type	String	Other
attribute	NC_GLOBAL	comment	String	Th-234 activity PI: Michael Landry (UCSD-SIO) Contact: Michael Stukel (UMCES) Version: 28 May 2014
attribute	NC_GLOBAL	Conventions	String	COARDS, CF-1.6, ACDD-1.3
attribute	NC_GLOBAL	creator_email	String	info at bco-dmo.org
attribute	NC_GLOBAL	creator_name	String	BCO-DMO
attribute	NC_GLOBAL	creator_type	String	institution
attribute	NC_GLOBAL	creator_url	String	https://www.bco-dmo.org/
attribute	NC_GLOBAL	data_source	String	extract_data_as_tsv version 2.3 19 Dec 2019
attribute	NC_GLOBAL	date_created	String	2014-05-28T20:07:40Z
attribute	NC_GLOBAL	date_modified	String	2019-12-11T19:31:49Z
attribute	NC_GLOBAL	defaultDataQuery	String	&amp;time&lt;now
attribute	NC_GLOBAL	doi	String	10.1575/1912/bco-dmo.516062.1
attribute	NC_GLOBAL	Easternmost_Easting	double	-86.76
attribute	NC_GLOBAL	geospatial_lat_max	double	10.33
attribute	NC_GLOBAL	geospatial_lat_min	double	8.37
attribute	NC_GLOBAL	geospatial_lat_units	String	degrees_north
attribute	NC_GLOBAL	geospatial_lon_max	double	-86.76
attribute	NC_GLOBAL	geospatial_lon_min	double	-92.92
attribute	NC_GLOBAL	geospatial_lon_units	String	degrees_east
attribute	NC_GLOBAL	geospatial_vertical_max	double	2002.25
attribute	NC_GLOBAL	geospatial_vertical_min	double	1.75
attribute	NC_GLOBAL	geospatial_vertical_positive	String	down
attribute	NC_GLOBAL	geospatial_vertical_units	String	m
attribute	NC_GLOBAL	infoUrl	String	https://www.bco-dmo.org/dataset/516062
attribute	NC_GLOBAL	institution	String	BCO-DMO
attribute	NC_GLOBAL	instruments_0_acronym	String	Mass Spec
attribute	NC_GLOBAL	instruments_0_dataset_instrument_description	String	Mass spec analysis of the 229:230Th tracer ratio took place at the Woods Hole Oceanographic Institution Analytical Facility.
attribute	NC_GLOBAL	instruments_0_dataset_instrument_nid	String	516066
attribute	NC_GLOBAL	instruments_0_description	String	General term for instruments used to measure the mass-to-charge ratio of ions; generally used to find the composition of a sample by generating a mass spectrum representing the masses of sample components.
attribute	NC_GLOBAL	instruments_0_instrument_external_identifier	String	https://vocab.nerc.ac.uk/collection/L05/current/LAB16/
attribute	NC_GLOBAL	instruments_0_instrument_name	String	Mass Spectrometer
attribute	NC_GLOBAL	instruments_0_instrument_nid	String	685
attribute	NC_GLOBAL	instruments_0_supplied_name	String	Mass Spec
attribute	NC_GLOBAL	instruments_1_acronym	String	Riso Beta Counter
attribute	NC_GLOBAL	instruments_1_dataset_instrument_description	String	Samples were beta counted at the University of South Carolina on a RISO low-level beta multi-counter within two months of the collection date.
attribute	NC_GLOBAL	instruments_1_dataset_instrument_nid	String	516065
attribute	NC_GLOBAL	instruments_1_description	String	Low-level beta detectors manufactured by Riso (now Nutech) in Denmark. These instruments accept samples that can be mounted on a 25mm filter holder. These detectors have very low backgrounds, 0.17 counts per minute, and can have counting efficiencies as high as 55%. See: http://cafethorium.whoi.edu/website/about/services_radioanalytical_facility_equip.html and http://www.nutech.dtu.dk/Produkter/Dosimetri/NUK_instruments/GM_multicounter.aspx
attribute	NC_GLOBAL	instruments_1_instrument_name	String	Riso Laboratory Anti-coincidence Beta Counters
attribute	NC_GLOBAL	instruments_1_instrument_nid	String	687
attribute	NC_GLOBAL	instruments_1_supplied_name	String	RISO low-level beta multi-counter
attribute	NC_GLOBAL	keywords	String	activity, altimetry, bco, bco-dmo, biological, cast, chemical, cycle, data, dataset, date, density, depth, dmo, erddap, event, iso, laboratory, latitude, longitude, management, niskin, oceanography, office, preliminary, sal, sample, satellite, th234, Th234_activity, time, u238, U238_activity, uncertainty
attribute	NC_GLOBAL	license	String	https://www.bco-dmo.org/dataset/516062/license
attribute	NC_GLOBAL	metadata_source	String	https://www.bco-dmo.org/api/dataset/516062
attribute	NC_GLOBAL	Northernmost_Northing	double	10.33
attribute	NC_GLOBAL	param_mapping	String	{'516062': {'lat': 'master - latitude', 'depth': 'flag - depth', 'lon': 'master - longitude', 'ISO_DateTime_UTC': 'master - time'}}
attribute	NC_GLOBAL	parameter_source	String	https://www.bco-dmo.org/mapserver/dataset/516062/parameters
attribute	NC_GLOBAL	people_0_affiliation	String	University of California-San Diego
attribute	NC_GLOBAL	people_0_affiliation_acronym	String	UCSD-SIO
attribute	NC_GLOBAL	people_0_person_name	String	Michael R. Landry
attribute	NC_GLOBAL	people_0_person_nid	String	50545
attribute	NC_GLOBAL	people_0_role	String	Principal Investigator
attribute	NC_GLOBAL	people_0_role_type	String	originator
attribute	NC_GLOBAL	people_1_affiliation	String	University of Maryland Center for Environmental Science
attribute	NC_GLOBAL	people_1_affiliation_acronym	String	UMCES/HPL
attribute	NC_GLOBAL	people_1_person_name	String	Michael R Stukel
attribute	NC_GLOBAL	people_1_person_nid	String	515983
attribute	NC_GLOBAL	people_1_role	String	Contact
attribute	NC_GLOBAL	people_1_role_type	String	related
attribute	NC_GLOBAL	people_2_affiliation	String	Woods Hole Oceanographic Institution
attribute	NC_GLOBAL	people_2_affiliation_acronym	String	WHOI BCO-DMO
attribute	NC_GLOBAL	people_2_person_name	String	Shannon Rauch
attribute	NC_GLOBAL	people_2_person_nid	String	51498
attribute	NC_GLOBAL	people_2_role	String	BCO-DMO Data Manager
attribute	NC_GLOBAL	people_2_role_type	String	related
attribute	NC_GLOBAL	project	String	CRD FLUZiE
attribute	NC_GLOBAL	projects_0_acronym	String	CRD FLUZiE
attribute	NC_GLOBAL	projects_0_description	String	Research was aimed at improved understanding of plankton dynamics, carbon and nutrient fluxes, and potential trace element limitation in the Costa Rica Dome region of the eastern tropical Pacific. The specific science objectives of the 2010 R/V Melville cruise (MV1008) were: 1) to assess grazing and trace metal/nutrient controls on primary production and phytoplankton standing stocks; 2) to quantify carbon and elemental fluxes and export rates from the euphotic zone; and 3) to measure microbial population, processes, stable isotope abundances associated with the OMZ and nitrite maxima. Additional information about MV1008 can be found in the cruise report (PDF). NOTE: The original proposal and award abstract are not relevant. The project was originally funded by NSF as experimental tests of phytoplankton controls in the Arabian Sea. Piracy concerns in the region led to the cancellation of the research cruise in 2009, and a Change of Scope request was approved to focus the project on related issues in the Costa Rica Dome (CRD). Though this project is not formally affiliated with any large program, it aligns with IMBER's emphasis on community ecology and biogeochemistry, and the OCB focus on carbon-based measurements of production, grazing and export processes.
attribute	NC_GLOBAL	projects_0_end_date	String	2013-12
attribute	NC_GLOBAL	projects_0_geolocation	String	Costa Rica Dome, Eastern Tropical Pacific Ocean
attribute	NC_GLOBAL	projects_0_name	String	Costa Rica Dome FLUx and Zinc Experiments
attribute	NC_GLOBAL	projects_0_project_nid	String	515387
attribute	NC_GLOBAL	projects_0_start_date	String	2009-01
attribute	NC_GLOBAL	publisher_name	String	Biological and Chemical Oceanographic Data Management Office (BCO-DMO)
attribute	NC_GLOBAL	publisher_type	String	institution
attribute	NC_GLOBAL	sourceUrl	String	(local files)
attribute	NC_GLOBAL	Southernmost_Northing	double	8.37
attribute	NC_GLOBAL	standard_name_vocabulary	String	CF Standard Name Table v55
attribute	NC_GLOBAL	summary	String	Water column Thorium-234 and Uranium-238 measured on the MV1008 cruise in the Costa Rica Dome (CRD) region of the Eastern Tropical Pacific Ocean.
attribute	NC_GLOBAL	time_coverage_end	String	2010-07-23T22:13:24Z
attribute	NC_GLOBAL	time_coverage_start	String	2010-06-27T01:10:29Z
attribute	NC_GLOBAL	title	String	[Th-234 activity] - Water column Th-234 activity determined using a 4-L technique from samples collected on R/V Melville cruise MV1008 in the Costa Rica Dome in 2010 (CRD FLUZiE project) (Costa Rica Dome FLUx and Zinc Experiments)
attribute	NC_GLOBAL	version	String	1
attribute	NC_GLOBAL	Westernmost_Easting	double	-92.92
attribute	NC_GLOBAL	xml_source	String	osprey2erddap.update_xml() v1.3
variable	event		short
attribute	event	_FillValue	short	32767
attribute	event	actual_range	short	110, 1098
attribute	event	bcodmo_name	String	event
attribute	event	description	String	Number referring to the particular deployment activity (event) on the FluZiE cruise.
attribute	event	long_name	String	Event
attribute	event	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P01/current/EVTAGFL/
attribute	event	units	String	integer
variable	cast		byte
attribute	cast	_FillValue	byte	127
attribute	cast	actual_range	byte	10, 84
attribute	cast	bcodmo_name	String	cast
attribute	cast	description	String	CTD Cast number from the FluZiE cruise.
attribute	cast	long_name	String	Cast
attribute	cast	units	String	integer
variable	cycle		byte
attribute	cycle	_FillValue	byte	127
attribute	cycle	actual_range	byte	1, 5
attribute	cycle	bcodmo_name	String	unknown
attribute	cycle	description	String	Refers to the 4-day Lagrangian experiment during which the sample was taken.
attribute	cycle	long_name	String	Cycle
attribute	cycle	units	String	integer
variable	depth		double
attribute	depth	_CoordinateAxisType	String	Height
attribute	depth	_CoordinateZisPositive	String	down
attribute	depth	_FillValue	double	NaN
attribute	depth	actual_range	double	1.75, 2002.25
attribute	depth	axis	String	Z
attribute	depth	bcodmo_name	String	depth
attribute	depth	colorBarMaximum	double	8000.0
attribute	depth	colorBarMinimum	double	-8000.0
attribute	depth	colorBarPalette	String	TopographyDepth
attribute	depth	description	String	Depth (in meters) that the sample was taken from as determined by CTD.
attribute	depth	ioos_category	String	Location
attribute	depth	long_name	String	Depth
attribute	depth	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P09/current/DEPH/
attribute	depth	positive	String	down
attribute	depth	standard_name	String	depth
attribute	depth	units	String	m
variable	niskin		byte
attribute	niskin	_FillValue	byte	127
attribute	niskin	actual_range	byte	1, 24
attribute	niskin	bcodmo_name	String	bot_Nis
attribute	niskin	description	String	Niskin bottle that the sample was taken from.
attribute	niskin	long_name	String	Niskin
attribute	niskin	units	String	integer
variable	sample		String
attribute	sample	bcodmo_name	String	sample
attribute	sample	description	String	Refers to a specific 234Th measurement.
attribute	sample	long_name	String	Sample
attribute	sample	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P02/current/ACYC/
attribute	sample	units	String	unitless
variable	latitude		double
attribute	latitude	_CoordinateAxisType	String	Lat
attribute	latitude	_FillValue	double	NaN
attribute	latitude	actual_range	double	8.37, 10.33
attribute	latitude	axis	String	Y
attribute	latitude	bcodmo_name	String	latitude
attribute	latitude	colorBarMaximum	double	90.0
attribute	latitude	colorBarMinimum	double	-90.0
attribute	latitude	description	String	Latitude (in degrees North) where the sample was collected.
attribute	latitude	ioos_category	String	Location
attribute	latitude	long_name	String	Latitude
attribute	latitude	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P09/current/LATX/
attribute	latitude	standard_name	String	latitude
attribute	latitude	units	String	degrees_north
variable	longitude		double
attribute	longitude	_CoordinateAxisType	String	Lon
attribute	longitude	_FillValue	double	NaN
attribute	longitude	actual_range	double	-92.92, -86.76
attribute	longitude	axis	String	X
attribute	longitude	bcodmo_name	String	longitude
attribute	longitude	colorBarMaximum	double	180.0
attribute	longitude	colorBarMinimum	double	-180.0
attribute	longitude	description	String	Longitude (in degrees East) where the sample was collected.
attribute	longitude	ioos_category	String	Location
attribute	longitude	long_name	String	Longitude
attribute	longitude	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P09/current/LONX/
attribute	longitude	standard_name	String	longitude
attribute	longitude	units	String	degrees_east
variable	sal		float
attribute	sal	_FillValue	float	NaN
attribute	sal	actual_range	float	33.45, 34.94
attribute	sal	bcodmo_name	String	sal
attribute	sal	description	String	Salinity determined by CTD.
attribute	sal	long_name	String	Sal
attribute	sal	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P01/current/PSALST01/
attribute	sal	units	String	practical salinity units (PSU)
variable	density		float
attribute	density	_FillValue	float	NaN
attribute	density	actual_range	float	1021.17, 1036.98
attribute	density	bcodmo_name	String	density
attribute	density	description	String	Density determined by CTD.
attribute	density	long_name	String	Density
attribute	density	units	String	kilograms per cubic meter (kg m-3)
variable	U238_activity		float
attribute	U238_activity	_FillValue	float	NaN
attribute	U238_activity	actual_range	float	2.31, 2.43
attribute	U238_activity	bcodmo_name	String	unknown
attribute	U238_activity	description	String	The activity of Uranium-238 (238U) estimated from salinity using the equation of Owens et al. (2011).
attribute	U238_activity	long_name	String	U238 Activity
attribute	U238_activity	units	String	decays per minute per liter (dpm L-1)
variable	Th234_activity		float
attribute	Th234_activity	_FillValue	float	NaN
attribute	Th234_activity	actual_range	float	0.68, 3.22
attribute	Th234_activity	bcodmo_name	String	thorium-234
attribute	Th234_activity	description	String	The activity of Thorium-234 (234Th).
attribute	Th234_activity	long_name	String	Th234 Activity
attribute	Th234_activity	units	String	decays per minute per liter (dpm L-1)
variable	uncertainty		float
attribute	uncertainty	_FillValue	float	NaN
attribute	uncertainty	actual_range	float	0.05, 0.58
attribute	uncertainty	bcodmo_name	String	unknown
attribute	uncertainty	description	String	The uncertainty in 234Th activity determined by propagating our measurement uncertainty.
attribute	uncertainty	long_name	String	Uncertainty
attribute	uncertainty	units	String	decays per minute per liter (dpm L-1)
variable	time		double
attribute	time	_CoordinateAxisType	String	Time
attribute	time	actual_range	double	1.277601029E9, 1.279923204E9
attribute	time	axis	String	T
attribute	time	bcodmo_name	String	ISO_DateTime_UTC
attribute	time	description	String	Date and time (UTC) of CTD cast from which the water was drawn formatted to ISO 8601 standard. format: YYYY-mm-ddTHH:MM:SS.xx
attribute	time	ioos_category	String	Time
attribute	time	long_name	String	ISO Date Time UTC
attribute	time	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P01/current/DTUT8601/
attribute	time	source_name	String	ISO_DateTime_UTC
attribute	time	standard_name	String	time
attribute	time	time_origin	String	01-JAN-1970 00:00:00
attribute	time	time_precision	String	1970-01-01T00:00:00Z
attribute	time	units	String	seconds since 1970-01-01T00:00:00Z

The information in the table above is also available in other file formats (.csv, .htmlTable, .itx, .json, .jsonlCSV1, .jsonlCSV, .jsonlKVP, .mat, .nc, .nccsv, .tsv, .xhtml) via a RESTful web service.